Paul McCartney working with Kanye West?

And you thought it was a big deal when he collaborated with John Lennon.

Sources reportedly told the New York Post the pair have been secretly working on a number of tracks, one allegedly titled "Piss on My Grave," and that the recordings "could develop into an album."

Charming title. I heard McCartney and Michael Jackson almost used it before deciding on "Say Say Say."

Daily Mail quoted sources last week saying West wants to feature McCartney on his follow-up to "Yeezus," which is due out later this year. The source said West has been "tapping Macca up for a while about working together." Kim Kardashian's husband was at McCartney's Los Angeles show at Dodger Stadium last week.

Paul McCartney performs on Day 2 of the 2013 Bonnaroo Music and Arts Festival on Friday, June 14, 2013 in Manchester, Tenn. (Photo by Wade Payne/Invision/AP)

The Huffington Post says McCartney's rep declined to comment on a possible collaboration, but did clarify West is working on a song called "Piss On Your Grave." The website reported that, in the past, the former Beatle has expressed interest in collaborating with a hip-hop artist like Jay Z or Kanye.